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Application filed by German A Parfenov, German P Pasev, Jurij N KirejevfiledCriticalGerman A Parfenov
Priority to CS833553ApriorityCriticalpatent/CS263456B1/en
Publication of CS355383A1publicationCriticalpatent/CS355383A1/en
Publication of CS263456B1publicationCriticalpatent/CS263456B1/en